If the refrigerator's efficiency is 12% and Q(cold) is 927 W, what is Q(hot) in kW?

If the refrigerator's efficiency is 12% and Q(cold) is 927 W, what is Q(hot) in kW?
1- If Q(cold) is 22 W, and Q(hot) is 92 W, what is the refrigerator's efficiency?(give as a fraction) 2- A building surface of 46 m2 is exchanging heat by convection with the air wind at 300 K. If the surface is at 400 K what is the rate of heat transfer in kW? (Air heat transfer coefficient, h, is 15 W/(m2 K)) (zero decimals and include units) 3- A house gains 387 MJ of heat during the day (8...
please answer all 10 questions! Question 1 If the refrigerator's efficiency is 61.7% and Q(cold) is 935 W, what is Q(hot) in kW? Question 2 Find the net radiative energy exchange (W) when: the area of radiative surface is 68 m^2, surface emissivity is 0.49, the cold temp is 433 K, and the hot temp. is 534 K. Question 3 Consider a device where the minimum input is 18, the actual input is 62, and the ideal output is 49....
An engine has a hot reservoir temperature of 927 K and a cold reservoir temperature of 631 K. The engine operates at four-fifths maximum efficiency. What is the efficiency of the engine?
Stream Type T. (°C) T(°C) CP (kW/°C) 1 ATmin= 10 1 2 3 Hot Hot Cold Cold 180 130 60 30 80 40 100 1 20 4 1.8 1. Develop a temperature interval diagram 2. Produce a problem table from the temperature interval diagram 3. Using heat cascade, state the pinch point, Hot & cold utility usage 4. What is the minimum number of units a) For max energy recovery b) Energy relaxation across pinch 5. Design a HEX network...
1. A Carnot engine has a hot reservoir at 250 degrees C, and a a cold reservoir at 25.0 degrees C. What is the efficiency of this engine? A) 10% B) 43% C) 57% D) 90% 2. A heat engine does 50 J of work and dumps 30 J of heat into the cold reservoir. How much heat was absorbed from the hot reservoir? A) 20 J B) 30 J C) 50 J D) 80 J 3. A heat engine...
Heat flows at a rate of Q/t from a hot object to a cold object through some material that has a thickness of d and a surface area of A. If the surface area of the material is increased to 2A and the thickness is increased to 4d then what rate does the heat flow from the hot object to the cold object now? [You may assume that the hot and cold object are unchanging in temperature.]
A Carnot engine operates with an efficiency of 29% when the temperature of its cold reservoir is 295 K. Assuming that the temperature of the hot reservoir remains the same, what must be the temperature of the cold reservoir in order to increase the efficiency to 33%?
Please, no referring. A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and
136 Ω when on (hot). Estimate the temperature of the filament when hot
assuming an average temperature coefficient of resistivity
α=0.0045(C)−1.
A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 152 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)−1.
A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 124 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)−1.